Von Duprin 33A/35A RimExit Devices Redesigned Von Duprin exit devices for narrow stile doors feature standard deadlocking, a new rod adjustment for concealed vertical rods, one-piece covers, and other improvements. The Von Duprin 33A/35A Series replaces the 33/35 Series.Latchbolts of all rim and vertical rod devices are molycoated for better lubrication. A surface vertical rod fire device is now an option. A one-piece cover eliminates seams and improves color consistency; other trim features include a uni-directional rotary output, field handling with bi-directional lever actuation, a recessed mortise cylinder and a shear pin for increased resistance to vandalism, and a direct rim cylinder input to the device